Wristwatch



FIG. 1 is a front view of my new and ornamental design for a wristwatch.

FIG. 2 is a back view thereof;

FIG. 3 is a right view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 perspective view thereof. 

The ornamental design for a wristwatch, as shown and described. 